Electronics > Projects, Designs, and Technical Stuff
1 mm accuracy IC sensor
Klemken:
Ye so veeeerrryyy basicaly, what i need is to make a miniature slow moving 3D scanner based on lidar ToF principle. But yea, after a lot of research, there isnt any technology capable of meeting my requirements. Due to varying surfaces reflective principle is not usable. I change my accuracy from 1mm to 3mm so now i am testing light based ToF VL6180X and sound based ToF CH-201.
DaJMasta:
There are definitely technologies that can do it, but probably not in priceranges you're looking at. Commercial/industrial fine detail 3d scanners often use structured light in conjunction with photogrammetry, which uses cameras and computing to build a model from pictures at many angles and this can produce very high resolution and detail when done correctly. Lidar sensors can be made to be this sensitive, but not that inexpensively, so for very accurate displacement measurements, laser interferometry is used instead (and actually, used laser displacement sensors may be cheap enough to start moving towards low budget applications).
For particularly slow moving scans, you can also try just averaging your measurements, even to the point of introducing some kind of external controlled noise source to try to reduce error, but you still do run into issues with reflectiveness of materials in some cases - though a light spray of a matte color paint can often overcome this, if it's an option.
Klemken:
Thanks for your input. Price is actually not the biggest problem (manufacturing costs can be up to 500 or 800€). Main problem is that whole thing must be as compact, because it will be used to scan inside of a object, that size of a average 0,7 l bottle.
Prehistoricman:
If you wanted to go custom, you could make your own ultrasonic range sensor. The poor minimum range of most US solutions is due to this dead zone created by the transducer itself. The transducer is designed to resonate at the chosen US frequency, and it will continue oscillating at that frequency for a short while after you stop driving it. So the non-cost effective solution is just to have two US transducers: one for transmit and the other for receive. I think most commercial designs don't do this because the transducer is the most expensive part.
The company I work for has been working on eliminating this dead zone with a single transducer for the past 6 months to a year. Still we haven't been able to see objects closer than 15cm.
--- Quote from: Klemken on February 21, 2020, 01:20:29 pm ---Thanks for your input. Price is actually not the biggest problem (manufacturing costs can be up to 500 or 800€). Main problem is that whole thing must be as compact, because it will be used to scan inside of a object, that size of a average 0,7 l bottle.
--- End quote ---
Ah. So US is probably not the way. You will have so many reflections off the sides of the object that you won't be able to see the end.
SiliconWizard:
--- Quote from: Klemken on February 21, 2020, 07:28:22 am ---Ye so veeeerrryyy basicaly, what i need is to make a miniature slow moving 3D scanner based on lidar ToF principle. But yea, after a lot of research, there isnt any technology capable of meeting my requirements. Due to varying surfaces reflective principle is not usable. I change my accuracy from 1mm to 3mm so now i am testing light based ToF VL6180X and sound based ToF CH-201.
--- End quote ---
I was suspecting it was something like a 3D scanner. I can understand the requirements about accuracy/resolution (could even understand if you were after something better than 1mm), but I'm not sure I understand your requirements in terms of distance range. Classic 3D scanners, even the small ones, are more working in the 100mm-200mm range or something, and often based purely on image processing, as Marco suggested. But again not as such short distances, why would you want to be so close to the target object? And why do you need such a tiny sensor? There's probably still a bit of your project that we don't understand (but you might not want to disclose it).
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version